J. Bacteriol., Jan 1996, 85-93, Vol 178, No. 1
Copyright © 1996, American Society for Microbiology

Comparative genome mapping of Pseudomonas aeruginosa PAO with P. aeruginosa C, which belongs to a major clone in cystic fibrosis patients and aquatic habitats

KD Schmidt, B Tummler and U Romling
Klinische Forschergruppe, Institut fur Biophysikalische Chemie und Padiatrische Pneumologie, Medizinische Hochschule Hannover, Germany.

A physical and genetic map was constructed for Pseudomonas aeruginosa C. Mainly, two-dimensional methods were used to place 47 SpeI, 8 PacI, 5 SwaI, and 4 I-CeuI sites onto the 6.5-Mb circular chromosome. A total of 21 genes, including the rrn operons and the origin of replication, were located on the physical map. Comparison of the physical and genetic map of strain C with that of the almost 600-kb-smaller genome of P. aeruginosa reference strain PAO revealed conservation of gene order between the two strains. A large-scale mosaic structure which was due to insertions of blocks of new genetic elements which had sizes of 23 to 155 kb and contained new SpeI sites was detected in the strain C chromosome. Most of these insertions were concentrated in three locations: two are congruent with the ends of the region rich in biosynthetic genes, and the third is located in the proposed region of the replication terminus. In addition, three insertions were scattered in the region rich in biosynthetic genes. The arrangement of the rrn operons around the origin of replication was conserved in C, PAO, and nine other examined independent strains.

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